they also said at the unveiling that anyone who wanted a Z/28 could get one.

Now the number 1500 keeps floating around

I would be just as happy with a SS 1LE with Z/28 wheels and its splitter/side skirts or the Z/28 itself.

I just want to know how much i need to fork over to make it happen

In the Jay Leno video at the 10:37 mark, Al says that "..we're actually gonna offer the Z28 parts through our Chevrolet performance catalog so if you have an SS, you can start buyin parts to upgrade it with our own GM Parts."

The Z28 spoiler and extension might be the following part numbers.
22946170 & 22946171
They are listed as 2014 only but currently discontinued. I've seen parts listed as discontinued before they have been available before.